參數(shù)資料
型號： PIC16CR7X
廠商： Microchip Technology Inc.
英文描述： 28/40-Pin, 8-Bit CMOS ROM Microcontrollers
中文描述： 28/40-Pin，8位微控制器的CMOS光盤
文件頁數(shù)： 33/172頁
文件大?。?/td> 1506K
代理商： PIC16CR7X
2007 Microchip Technology Inc.
DS21993C-page 31
PIC16CR7X
4.0
I/O PORTS
Some pins for these I/O ports are multiplexed with an
alternate function for the peripheral features on the
device. In general, when a peripheral is enabled, that
pin may not be used as a general purpose I/O pin.
Additional information on I/O ports may be found in the
“
PIC
Mid-Range MCU Family Reference Manual
”
(DS33023).
4.1
PORTA and the TRISA Register
PORTA is a 6-bit wide, bidirectional port. The corre-
sponding data direction register is TRISA. Setting a
TRISA bit (=
1
) will make the corresponding PORTA pin
an input (i.e., put the corresponding output driver in a
High-Impendance mode). Clearing a TRISA bit (=
0
)
will make the corresponding PORTA pin an output (i.e.,
put the contents of the output latch on the selected pin).
Reading the PORTA register reads the status of the
pins, whereas writing to it will write to the PORT latch.
All write operations are read-modify-write operations.
Therefore, a write to a port implies that the port pins are
read, the value is modified and then written to the
PORT data latch.
Pin RA4 is multiplexed with the Timer0 module clock
input to become the RA4/T0CKI pin. The RA4/T0CKI
pin is a Schmitt Trigger input and an open drain output.
All other PORTA pins have TTL input levels and full
CMOS output drivers.
Other PORTA pins are multiplexed with analog inputs
and analog V
REF
input. The operation of each pin is
selected by clearing/setting the control bits in the
ADCON1 register (A/D Control Register1).
The TRISA register controls the direction of the RA
pins, even when they are being used as analog inputs.
The user must ensure the bits in the TRISA register are
maintained set, when using them as analog inputs.
EXAMPLE 4-1:
INITIALIZING PORTA
FIGURE 4-1:
BLOCK DIAGRAM OF
RA3:RA0 AND RA5 PINS
FIGURE 4-2:
BLOCK DIAGRAM OF
RA4/T0CKI PIN
Note:
On a Power-on Reset, these pins are
configured as analog inputs and read as
‘
0
’.
BCF
BCF
CLRF
STATUS, RP0
STATUS, RP1
PORTA
;
; Bank0
; Initialize PORTA by
; clearing output
; data latches
; Select Bank 1
; Configure all pins
; as digital inputs
; Value used to
; initialize data
; direction
; Set RA<3:0> as inputs
; RA<5:4> as outputs
; TRISA<7:6>are always
; read as ‘0’.
BSF
MOVLW
MOVWF
MOVLW
STATUS, RP0
0x06
ADCON1
0xCF
MOVWF
TRISA
Data Bus
P
N
WR Port
WR TRIS
RD TRIS
RD PORT
V
SS
V
DD
I/O pin
(1)
Note
1:
I/O pins have protection diodes to V
DD
and V
SS
.
Analog
Input
Mode
TTL
Input
Buffer
To A/D Converter
EN
Q
D
EN
Data Latch
TRIS Latch
Q
D
Q
CK
Q
D
Q
CK
DataBus
WR PORT
WRTRIS
RD PORT
Data Latch
TRIS Latch
RD TRIS
Schmitt
Trigger
Input
Buffer
N
V
SS
I/O pin
(1)
TMR0 Clock Input
Q
D
Q
CK
Q
D
Q
CK
EN
Q
D
EN
Note
1:
I/O pin has protection diodes to V
SS
only.
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